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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03d176d714dcf2929abec0c1fb8d78ed0d4cf500474deb7fe7f29f99af5cadc' 
  AND token = '3sBiliBlZTnrEUnerUByWejPrB8swk49lwI00KD/+9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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