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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab4d392960e93b4700a628ce8604eca1e0e52f5ae18c46cbc756585bfda7e92' 
  AND token = 'qrQs6wQtgztZ4Pyewg8f1GbC1GI9jvhx/C9Q1wzbn5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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