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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574ec8ddefae2c443c4036e9d93468e9fad8c7929896bcae6ecdfa3a489df892' 
  AND token = 'nva1kJUHCH48Fxcmu05VDFC4qeLfF+69Yvmls/Cl7lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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