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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a33d381aa01389503b7c83d54b1d7573e95ea3f27789b3d30c6e4c454192e35' 
  AND token = 'Mp80Lo44E0RzjPTK2yCD59QVW3/ZIFIeGeTosJakByc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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