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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff769626bfcb4ddb507b93c574d28d7871611e2591eab9d423e4c8871ed7590' 
  AND token = 'T7CV1U/KM2f7lpIzo2B1dH5TefgNK/8orVGCUDidXCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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