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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22a0f93b983077ce4f51c11203b2f7ba6244b2784bfc85fc06dec35175a3b0a0' 
  AND token = 'iBZ7KFWtsKQUomuIny7vwcR0NHL5WQG9G/mkM6udPhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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