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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36b81b76c66df83d9f50966a91e5fd145c8b7183648d78b3bc90e825555c4a5' 
  AND token = 'gDoWNY6a7nlULIlJaUzO5H6pM3/rQ//QnRKSVWy8f8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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