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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad696660fef8bf49878ecde159cd6627dc404883dcda53f6f55b5d447053d164' 
  AND token = '52GX6Y2cWTGPnMJuyck4BQhpgPFJsI5MdEqdJ4SPDag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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