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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e674a4f62e0b941fd6fd8cf9ce45a13ab72f687eb604497b772bd7d983c7eb' 
  AND token = 's7QsNAoB8EkZqie3IB2udiaYBs6bhp++9OzmTyFSoj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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