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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6807d225c979b913d75c81589126c0350ce1e4b82235367c5ee8b533df24937c' 
  AND token = 'I0oW5jcqOvfgBib+avHOdKbIH7ky1oeTN3n/Wi8XF4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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