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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c0a52fbca757aa8dfb2ca145131ca356c3f423c9e69a6c9dce6792de3944cc' 
  AND token = 'HvvwTTMWtRTwyzr6XeZ8DH5cfw0WwZz5zGbx+Qk/Piw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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