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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69c13148ec4d4810d0089b49789186c744cc09c0a9984c52ee8ea2db06555c1' 
  AND token = '+Mzm2H0AZdG1GjqTWaG9P2SldEoA5VEUOeGnFkmSOkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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