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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24a381351a647b27625624476f4b491b7e9f8866b1f0f655ec3d8dd4a25b635' 
  AND token = '9EDGORX1JtwutVTRRLuuMc3vHFSauRMAAH7KjKDrxbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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