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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a432d5c8178eb22e63b8f538aa7d3672433fed48b5611780a1b4f525e055ec7' 
  AND token = '1RLBMh8QOODdQJC68bvsPv0lBcMMIlbUba59PtWenDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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