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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7b6a1e22286aabb3d5c20f6880d9184b65078bdfbb5766ef12135710bb0acf' 
  AND token = 'OXJqaXeJSucRBWEpEwxmnmvdnQWF8Cu2lk9vnkVKFnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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