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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa1bc5ba325b2931c71184bda37c39240762ba69e61421029d93f05417dc5d0' 
  AND token = 'tEx4BW4+o6i5RM2gK4oL1wPlDZ0x9gg9V9n6Kda3/Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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