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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea00a649782f53f1066be14ef95eb852667a7c599caae899b9552a4a85c6740' 
  AND token = '1ClARMZtWx25uUSbRN9eb2qpHeMNCVDUOEZ3f/lmb+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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