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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e48c2a08f1212bcb112d07024e2140f218460048ffa48c8b86b0064b80e1d6c' 
  AND token = 'eH2hS4jg59oJXDYMeYnCZWZKOuUCtlu30vPrAM/Exo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00527

JSON explain

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