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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacbbf527d1bbd574307ee16ca2b97c3593e7f249e2586b443ee999e7a0cb47d' 
  AND token = '8qP3zoxmR85SXOmQ6N78TkF2KUXJFjTnIiQYJFB2ZL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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