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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b9bfbac2d41b6737be9c0767510ebf379c6bc9eaea1ed8a5ff00ef882b1613' 
  AND token = 'i0pa5cyz9BYUWdbr+Ht4Ex6Cnd7NW+cZt+/gxmobMEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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