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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0b9a2be1b989463e85978484fc2f41e4a2fd88c77c1dae6dee9feec78052aa' 
  AND token = 'mHUwqVAksVy3zkZaTSm36v1QoATckNwI3sgmyrkk/WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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