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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2802369555f912a3bf05674ce8452a6dd525c35a3a159d076ab48c083708474b' 
  AND token = '+SF8936gtT9Fkv7LsVWOrRuD5FZ81MPUPySOUsV65Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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