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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9eec94cdabf5815c64ec0a435acf36eb9f82b4f73babea108c017fa7aa6a5b0' 
  AND token = 'm6W7bRcMWMrXhHEDnQmg8ZBFOyetBjsRPW7j+Y7S1Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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