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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fe9c50fd7e67aa4fc240dfa6ceb6ef656cd4dcddb583e81b136656264244c9' 
  AND token = 'Xz4ijcXgEcPu20X6zVjHrhUR7a0JV3lZQk5aE9iriHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00170

JSON explain

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