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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37008bf16ee9e38d95452c27f7605bb99f4e7bf321fc287b9f761922913a678' 
  AND token = 'PHgPRiPH1jzz466kUuQgv5pu/cbG2A950vOf6v7P4eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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