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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5597e190351366cacce9b834e5e1362918a1941e94749d1fce419a9246453ab7' 
  AND token = 'xmm6t8TdG+8MGbqOT8VvHO80boDNCpXU6f+QU9DUIVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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