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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e751c46b346af2183153084d7516c1c952bf386a72c6c320014755c2f1fff73a' 
  AND token = 'PlWlZC/XyP1R2lPKOV5/A25Cj/AKscvlxzAniq5Mj5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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