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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46ffb11eae8e6d3697b0d7f47187cbdf6b628d9cbec7353b2c06b4c41783f9b' 
  AND token = 'm7QszTF97CxxdMZVBY6tws32H0hYDc6JI9XxMCn0cYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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