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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366ee7be40de86acb0be304b495259eeb77b75e50bde750fcd631d745382fef8' 
  AND token = '4pQzVNQ02jchSt5bNXkZ78vY5K95QYljggRSfEoBQVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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