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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd60763190fb787cc00b9b0b415747da36f4f3abeba7e7a896c18238484a3f0' 
  AND token = 'Oy8hDesPE6al0teXQxgQ+GJr+zkDTHMmGfrDr+VZcmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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