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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e30def4387483b273d615210d90c5da6dce5d16d0ee975f59767926f478c6d' 
  AND token = 'gFW+f/9UUXdmK2XKItjgo5iyqlF9XL8HPtRuH+Xm6es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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