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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9258f7f49b43e7ab5c6101646279790381306b79c7104aa756651f6bfe4385' 
  AND token = 'feHb3BHjVbiuJIukcb3vhRk+Cn1VcD9oc/UrJX+7Shk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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