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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45bb42f4a52d0d595d9aeaf161afbdcb48d346d14c4181f06a7e0f0d9184c010' 
  AND token = 'v/WvECeekMJclkroJphBwEryQqpTidChDjmbVIaMKyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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