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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07912d89b5d9de239a0e911ef8b38db3e459bf2abf6b08383dd40ad3a4bd0df6' 
  AND token = '3BQJsPUSRCXgzNtP5nbTAs6GTiwSwnFp7XIyDoVWaCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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