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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1c770e7b6448b4aacc0fe2cb13f645439244d5fd6615c07ff2ccf3448beab5' 
  AND token = 'WqIs9yTwoOHfpX2NwpVMQK61qDnyJf+iXP7YrcxrcIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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