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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc27e286df15dd12ba82aed062acb72f95ffda567b831039f2ac2dafda32f1f' 
  AND token = '6mW/LxiwPLH61yGasr/okNZrn5Z5tf2WV9bXQP496dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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