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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bac2a19c07415d14b2469d2253d08bd5466a9ba2f80f52946208ba94cf1d0ba' 
  AND token = 'LfxI/guz+QVa6me4bKTbyx1KjvjJPXvKAemMBGss998=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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