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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a555470347336558ab286943131e1daec2b2419f2047e3c7da7fc7879753e407' 
  AND token = 'bgkTYKt289yEQUBX+fdL4Iru99Cu9QE/8nGk6FN4wYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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