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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39ee90902b87ec0c3b0f90d1ea3dee0eec5bdb318583113640479a554e452da' 
  AND token = 'vOXAE2rIduGMi95hNjEtGjS31p0SOo8cKCinHnLInPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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