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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eddbbed65a11ba8e31c6cddb44c92a2226e62b9c363ca4357a69b89ca05979b' 
  AND token = 'd9GrK4cO0pxnGi7BPepY3WiFZJUzEEOXB1HuB+i2CAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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