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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c31482ec233e9db9efd41f98604da10f8c58a86ae3cf178a1838460a5f86b4' 
  AND token = 'ZPORrz2uxRONEWAniDIzUHukiJL8Mg44+0QcHLg+4i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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