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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672a63e1f7f831bd57284e0ffc452c203dda0605a893aeb14dc191065a7a17ae' 
  AND token = '9u78jX60/v/cZZqiMHuMPdqb/3j8uEAXRX/K2/tnVSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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