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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa9bb8b16589d27a88da8e830ef9ec8f2d2318dd67a638a5eaa34eab0313c61' 
  AND token = 'gV+igYlIucJw9Z8cOSNJH5AljXd3FzNBfvL1Bmv1ba4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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