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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c49e37bcbb195e35fdbb22469fad0dbdfd0a8f44e67e85d00b38647e9c0be26c' 
  AND token = 'qKZ6PRVy6nygEE/N9UYNrLjotir01HJrj7kbYurrcDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}