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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534401985ca0b3d537b62b1db85d6b142b8f26773ee75dd93648f15995822836' 
  AND token = 'L1oF6yuBOQ4diTwabzc3yLez5Q37eDvnx6AhRh6Z7kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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