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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce84b701cd1c256996be3a9dd60d28e53db4c3eb349eae09fe24c081cf76b38e' 
  AND token = '/Oh/1+nk/41Vw9ZpqFTWzRQ8Hcc1odwpB0ByR5dPyp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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