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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7629bdb287808747beb8e1f0719f96cae60d462ab37f1c36652bffa5ee6cbd' 
  AND token = '5zTcn213GjrZJAuXPuPowAv3Ls6Z6XayMoaY7PKMeZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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