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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46575d76f4aa99796026ea9d46bc91c8a05a587bd198f3470abb8e4be0ca6e9' 
  AND token = 'RONh38TlfL0nno7ANMsYN2glRbQhwNd+H+uX4UZDGhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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