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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b935095182849f7a738187c9d2ae7137dbd027abbccca39e94c32df8ea10a0' 
  AND token = '+MhHeiF4CkZX10ghUDv16Fo6tQ+IIYGml5D61iUgWQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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