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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190c9d34ab59407c058a567cb2c9e12aecb9df5f19e88a77e84238541e5a19a2' 
  AND token = '231oVdwzbJVqeDOvSfXIwwjiyNad12t+OLf/DVZZNMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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