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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eba9c84a68c8ffcb1b6c3d0499002bee56ac0ee1fb2e8222030606c67a4d6a7' 
  AND token = '7rBgyPIvPiEVwsK1cySgVOi8pEviu+yG5H1c3E4NLbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00216

JSON explain

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