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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0caeae21d8051a5c63b2e7f0e301f01eb5c2b502e5c76490ce2d155edb81f3d' 
  AND token = '+gbovXaqN7i7XPRQ3yPfvMV09bXN5yLCyALOIojuGBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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