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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2ec157d1a30268bee7313594d1634b7ee301eb65c4a17542d2a126845a8c8c' 
  AND token = '113eRy2eVk0ASWVWqY2pSTj7FrvKOXK/cCvSpxPFS4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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