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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2fec078cedcc7d5579c621f5932d98fe4edcf37702744d09366b23fe1b6916f' 
  AND token = 'pKn0xA83P16VCyxxca6NDXDbcg1ECzpFa7fl4F5BMdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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